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Manganese dioxide/carbon combined electrode and electric adsorption method for electrically adsorbing heavy metal ions from water

A technology of heavy metal ions and manganese dioxide is applied in the field of water treatment to achieve the effects of high electrochemical stability, enhanced adsorption, and simple operation.

Active Publication Date: 2014-07-23
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there is no research report on using manganese dioxide as an electrode material to remove heavy metal ions in water by electrosorption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A manganese dioxide / carbon composite electrode used for electric adsorption of heavy metal ions in water. The manganese dioxide / carbon composite electrode uses mesoporous carbon as a matrix and manganese dioxide is loaded on it.

[0031] The preparation method of the manganese dioxide / carbon composite electrode adopts electrochemical method:

[0032] Under the three-electrode system with the saturated calomel electrode as the reference electrode, the manganese-containing solution with a concentration of 0.5-2M is used as the electrolyte, and the deposition time is selected to be 500-7200s, and a constant current or voltage is applied to the mesoporous carbon. Chemical deposition, Mn after deposition 2+ Oxidized to form MnO 2 Loaded on mesoporous carbon, rinsed and soaked repeatedly with a large amount of deionized water, and dried at 105°C for 1 to 5 hours to form a manganese dioxide / carbon composite electrode.

[0033] Cu in the water to be treated set in the electro...

Embodiment 2

[0036] The invention discloses a manganese dioxide / carbon composite electrode used for electric adsorption of heavy metal ions in water. The manganese dioxide / carbon composite electrode uses activated carbon fiber as a matrix and manganese dioxide is loaded on it.

[0037] The preparation method of the manganese dioxide / carbon composite electrode adopts electrochemical method:

[0038] Under the three-electrode system with the saturated calomel electrode as the reference electrode, the manganese-containing solution with a concentration of 0.5-2M is used as the electrolyte, and the deposition time is selected as 1000s, and a constant current or voltage is applied to the activated carbon fiber for electrochemical deposition. Mn after deposition 2+ Oxidized to form MnO 2 Loaded on activated carbon fiber, rinsed and soaked repeatedly with a large amount of deionized water, and dried at 105°C for 1-5 hours to form a manganese dioxide / carbon composite electrode.

[0039] Pb in the...

Embodiment 3

[0042] The invention discloses a manganese dioxide / carbon composite electrode used for electric adsorption of heavy metal ions in water. The manganese dioxide / carbon composite electrode uses active carbon as a matrix and supports manganese dioxide on it.

[0043] The preparation method of the manganese dioxide / carbon composite electrode adopts electrochemical method:

[0044] Under the three-electrode system with the saturated calomel electrode as the reference electrode, the manganese-containing solution with a concentration of 0.5-2M is used as the electrolyte, and the deposition time is selected as 1000s, and a constant current or voltage is applied to the activated carbon for electrochemical deposition. After Mn 2+ Oxidized to form MnO 2 Loaded on activated carbon, rinsed and soaked repeatedly with a large amount of deionized water, and dried at 105°C for 1 to 5 hours to form a manganese dioxide / carbon composite electrode.

[0045] Cu in the water to be treated set in th...

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Abstract

The invention relates to a manganese dioxide / carbon combined electrode and an electric adsorption method for electrically adsorbing heavy metal ions from water. The manganese dioxide / carbon combined electrode is manufactured by taking a carbon material as a substrate and supporting manganese dioxide on the substrate. A voltage is applied to the manganese dioxide / carbon combined electrode so that electropositive heavy metal ions in water migrate to a cathode under the action of electric field force, and therefore, heavy metal ions in water are removed by electric adsorption. The manganese dioxide / carbon combined electrode is simple in preparation method, large in capacitance, high in electrochemical stability and large in specific surface area of electrode, and thus very suitable for being used as an electric adsorption electrode material; under the action of the applied electric field, the adsorption effect of the supported manganese dioxide on heavy metal ions is enhanced, quick and efficient removal of heavy metal ions in water can be realized and quick and convenient regeneration of the electrode material also can be realized; the shortcoming in the prior art low-concentration heavy metal ions in water are hardly removed is overcome, and therefore, the manganese dioxide / carbon combined electrode and the electric adsorption method can be used for removing the heavy metal ions having the concentration of several to dozens of ppm out of water.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a manganese dioxide / carbon composite electrode used for electroabsorbing heavy metal ions in water and an electrosorption method. Background technique [0002] At present, my country's water pollution situation is grim. Heavy metals are one of the important pollutants, threatening the water ecosystem and the health of the public. Therefore, the development of efficient methods for removing heavy metals in water has always been a research and development hotspot in the field of water pollution control. In recent years, water treatment electro-adsorption technology is an emerging hot technology, which has been gradually used in wastewater desalination, drinking water purification and other aspects. Compared with traditional technologies, such as ion exchange, distillation, electrodialysis, reverse osmosis, nanofiltration, adsorption, solvent extraction, etc., e...

Claims

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Application Information

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IPC IPC(8): C02F1/469C02F1/62
Inventor 胡承志刘会娟曲久辉刘方园兰华春
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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